CVE-2026-98023 Linux Kernel vxlan - Use After Free

Linux kernel vxlan contains a use-after-free vulnerability caused by allowing dynamic FDB entries to reference FDB nexthops without proper locking, letting attackers cause list corruption and kernel crashes, exploit requires configuration of dynamic FDB entries pointing to nexthops.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.12% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix that rejects dynamic FDB entries pointing to FDB nexthops.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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